feat: Update SIMAP Connector Service and related components

- Added support for connection management in the SIMAP Connector Service.
- Updated connection environment variables in simap_connectorservice.yaml.
- Enhanced Connection.py with a new function to retrieve connections.
- Modified SimapConnectorServiceServicerImpl.py to assert worker types.
- Refactored __main__.py for improved import organization.
- Updated ObjectCache.py to handle connection objects and caching logic.
- Enhanced SimapUpdater.py with connection event handling and telemetry updates.
- Added utility functions in Tools.py for connection endpoint and link retrieval.
- Improved worker class in _Worker.py for better thread management.
- Updated SyntheticSamplers.py to use current timestamp for sampling.
- Added new JSON test data for L3VPN requests.
- Created deployment and dummy scripts for L3VPN testing.
- Added log dumping script for easier log collection during testing.